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Yeah, finding good mechanics is hard. I can't help you on that, as i live on the other side of the world... just remember building an engine is a tough job. If you can't do it, or can't afford it, get a new engine and drop it in.
Unfortunately, these cars cost a lot of money. If you can't maintain them (that includes paying for a rebuild, or at least the parts and doing it yourself if you really know what you are doing), stay away from them. I feel sorry for you as you already started to throw money at it, just stop spending money now if you don't know what you are doing.
You also need to understant that a spun bearing is a consequence of something gone wrong, not a cause. Changing it (and the rod, and the crank) and hoping for the best is the best way to kill a crank and rods again. You could compare spinning a bearing to havin an electrical breaker go. Replace the breaker without fixing the short circuit, and it will break again.
These bearings aren't weak, they can take 500+ HP all day long. They usually fail when lubrication fails, i.e. when the oil pump is worn or the oil level is too low (or oil has degraded too much). there is no black magic here, so the first step is to find WHY you spun a bearing. If you can't find, you should seriously consider getting another engine.
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